<template>
  <div :class="{'hidden':hidden}"
       v-if='total>0'
       class="pagination-container"
       ref='pagination'
       id='pagination'>
    <el-pagination class="pagination"
                   :background="background"
                   :current-page.sync="currentPage"
                   :page-size.sync="pageSize"
                   :page-count='total'
                   :page-sizes="pageSizes"
                   :layout='layout'
                   @size-change="handleSizeChange"
                   @current-change="handleCurrentChange" />
  </div>
</template>
<script>
import { scrollTo } from '@/utils/scrollTo'
export default {
  name: 'Pagination',
  props: {
    total: {
      required: true,
      type: Number
    },
    page: {
      type: Number,
      default: 1
    },
    limit: {
      type: Number,
      default: 20
    },
    pageSizes: {
      type: Array,
      default () {
        return [4, 5, 10, 20, 30]
      }
    },
    layout: {
      type: String,
      default: 'total, sizes, prev, pager, next, jumper'
    },
    background: {
      type: Boolean,
      default: true
    },
    autoScroll: {
      type: Boolean,
      default: true
    },
    hidden: {
      type: Boolean,
      default: false
    }
  },
  computed: {
    currentPage: {
      get () {
        return this.page
      },
      set (val) {
        this.$emit('update:page', val)
      }
    },
    pageSize: {
      get () {
        return this.limit
      },
      set (val) {
        this.$emit('update:limit', val)
      }
    }
  },

  methods: {
    handleSizeChange (val) {
      this.$emit('pagination', { page: this.currentPage, limit: val })
      if (this.autoScroll) {
        scrollTo(0, 800)
      }
    },
    handleCurrentChange (val) {
      this.$emit('pagination', { page: val, limit: this.pageSize })
      if (this.autoScroll) {
        scrollTo(0, 800)
      }
    }
  }
}
</script>

<style scoped lang='scss'>
.pagination-container::after {
  display: block;
  content: "";
  clear: both;
}
.pagination-container {
  background: #fff;
  padding: 10px 16px;
  .pagination {
    float: right;
  }
}
.pagination-container.hidden {
  display: none;
}
</style>
